Asking, because we're planning a small FOSS project event with plans for decent remote participation...
@raucao I've seen BigBlueButton (OSS) used for things like that. You may know it as a video conferencing tool, but the default centerpiece there is a presentation screen, which defaults as digital, shared whiteboard, but you can also load PDF presentation slides into it.
It's just a bit resource hungry, so there aren't many public servers out there, but you can find managed hosting solutions.
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